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ZSearch is a general purpose text search engine written entirely in PHP 5. Since it stores its index on the filesystem and does not require a database server, it can add search capabilities to almost any PHP-driven website. ZSearch supports the following features:
Ranked searching - best results returned first
Many powerful query types: phrase queries, wildcard queries, proximity queries, range queries and more [5]
Search by specific field (e.g., title, author, contents)
ZSearch was derived from the Apache Lucene project. For more information on Lucene, visit http://lucene.apache.org/java/docs/.